Improved machine for stripping file-blanks



UNITED STATES PATENT OFFICE.

ALBERT MARSHALL, OF LAWRENCE, AND A. B. SOUTHWICK, OF BAL- LARDVALE,MASSACHUSETTS, ASSIGNORS TO THE WHIPPLE FILE MAN-y UFACTURING COMPANY.

IMPROVED MACHINE FOR. STRIPPING FILE-BLANKS.

Specification forming part of Leiters Patent No. 39,775, lated Septemberl, 1863.

To all whom it may concern:

Be it known that we, ALBERT MARSHALL, of Lawrence, and A. B. SOUTHWIGK,of p Ballardvale, both in Athe county of. Essex and State ofMassachusetts, have invented a new and improved machine for the purposeof stripping or draw-hling77 fileblanks, of which the following is afull, clear, and exact description, reference being had to theaccompanying drawings, making part of this specification, in which-Figure lis a perspective View of our machine; Fig. 2, an elevation ofone end of the same; Fig. 3, a detached view of the rods l and les g,with their holders and with ablank between the files; Fig. 4, a View ofone of the stripping-files.

File-blanks, after they are forged and ground, require to be stripped ordraw-tiled in order to file out any irregularities that may have beenleft by the grindstone and to render their surfaces smooth and uniform.This operation is sometimes performed after the file has been out in onedirection, and before the ual cutis made, in order to remove the burrmade by the first cut, the machine in such case being so arranged as tofile more 0r less deep, as may be required. In general, however, theblank is stripped before the cutting is commenced, and for this purposethe machine is arranged, as represented in the accompanying drawings, inwhich- A is the frame-work which supports the operating parts of themachine in suitable bearings on which runs the driving-shaft B, whichcarries at one end the drivin g-wheel C and at the other a crank-wheel,D. To this wheel is pivoted the connecting-rod E, which is attached atits other end to the sliding carriage F, which is furnished withdovetailed grooves and runs on the piece G, attached to the frame-work.To this carriage is secured by the pin o the file-holder H, in a mortiseiu which the tang of the leblank l is inserted, and held in place by thescrew a, and thus, as the wheel C is revolved, the blank, through theconnections already explained, is vibrated back and forth, as required.

K is a shaft running in the frame work A.

This shaft carries at one end the cog-wheel L, in which works thewormwheel M on the driving-shaft, and at the other a crank, b, thecrank-pin c of which plays in the slot d of the hanger N. From thishanger projects the rod e, which plays in the pieces O, attached to theframe-work. To this rod are attached by screws f the ears P, betweenwhich are secured the ends of the iiles g. whicl smooth oftl the blank,and thus, as the rod e is vibrated back and forth by means of the crankb, the files g are carried slowly back :and forth, so that the whole oftheir surfaces shall be uniformly exposed to wear. The files g are keptin contact with and pressed against the upper and under surfaces of thefric-blank in the following manner, (referring pai tcularly to Fig. 3:)t' i a-re two blocks or holders whichare mortised out, as seen in Fig.3, leaving tenons which fit into grooves in the edges of the les g.These blocks are held from moving transversely by the four posts 7c,rising from the framework. Zlare two rods or levers pivoted at m. Theserods pass through projections on the blocks or holders z' i, and theirouter ends n, are grasped by the operator, who, by this means, causesthe tiles g to bear with more or less pressure on the file-blank, as itis vibra ted back and forth between them. The connecting-rod E is madeadjustable in grooves in the carriage F and wheel D, so as to shorten orlengthen the stroke in accordance with the length of the file-blankbeing operated upon.

The files g may be of any suitable length, the ears P, between whichthey are held, being made adjustable on the rod e for this purpose,

and when adjusted are held in place by the t set'screwsf. Y

The wire s, attached to the carriageF, is for the purpose of preventingthe screwa from catching over the end of the piece G in case theiile-holder H should turn.

It is obvious that the mechanism employed i for the purpose of vibratingthe blank, as well as that used for holding the files g, and for movingthem slowly across the file, may be varied to a considerable extentwithout departing from the spirit of our invention.

What We claim as our invention, and desire in the manner substantiallyas herein set to secure by Letters Patent, is forth.

The machine, substantially herein described, for stripping file-blanks,consisting,essentia1 1y of the mechanism for holding and vibrating thefile-blank, 0r its equivalent, in combina- Witnesses: tion With themechanism for holding and Vi- P. E. TESCHEMACHER, brating the files g,orits equivalent-,operating N. W. STEARNS.

ALBERT MARSHALL. A. B. SOUTHWICK.

